An innovative multi-material battery enclosure developed by Teijin Automotive Technologies (formerly Continental Structural Plastics) has received the Society of Plastics Engineers (SPE) ACCE People’s Choice Award. The winner of this award is selected from all of the SPE ACCE Innovation Awards entries at the annual automotive composites exposition.

The full-sized, multi-material battery enclosure features a one-piece composite cover and tray with aluminum and steel reinforcements. By molding the cover and tray each as a single piece, the system is easier to seal and certify prior to shipment. Teijin Automotive has two patents pending for its innovative box assembly and fastening systems.

The company also developed a mounting frame utilizing a structural foam for energy absorption. This enables reduced frame thickness and weight while improving crash performance.

“As the automotive industry moves toward electrification, Teijin Automotive Technologies’ R&D teams are continually searching for composite solutions that make sense for our customers and end users,” said Steve Rooney, CEO of Teijin Automotive Technologies and General Manager of Teijin Composites Business Unit. “This full battery enclosure is an example of how composites can make EVs lighter, safer, and less complex from a servicing perspective.”

Teijin Automotive’s multi-material battery enclosure is 15% lighter than a steel battery box. Although it is equal in weight to an aluminum enclosure, it offers better temperature resistance than aluminum, especially if the phenolic resin system is used. Additionally, the one-piece design for the tray has no through holes, so no sealing or sealant is required. This not only eliminates the chance of leaks, but also reduces overall production cost and complexity.